CN110080027A - A kind of full stalk technique for chemomechanical pulp-making of corn stover - Google Patents
A kind of full stalk technique for chemomechanical pulp-making of corn stover Download PDFInfo
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- CN110080027A CN110080027A CN201811414874.6A CN201811414874A CN110080027A CN 110080027 A CN110080027 A CN 110080027A CN 201811414874 A CN201811414874 A CN 201811414874A CN 110080027 A CN110080027 A CN 110080027A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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Abstract
The present invention relates to a kind of using the full stalk of corn stover as the chemical mechanical pulping clean pulping process of raw material, the corn stover after cutting hot water is carried out first to extract in advance, after separation of solid and liquid, stalk squeeze grinding and handles and washs, is washed after the pre-impregnated processing of rear stalk and is carried out three sections of highly concentrated atmospheric refining runs again and obtain high yield pulp1, high-intensitive chemi-mechanical pulp；Being breaking in conventional chaffcutter for the corn stover carries out；The hot-water extraction is normal pressure, without chemicals, heating self-catalysis extracting；The crowded stone roller process is squeezed in mill in twin-screw to be carried out；The pre-preg is impregnated using sodium hydroxide normal pressure；Three sections of highly concentrated atmospheric refining runs carry out in highly concentrated normal pressure disc mill.Beneficial effects of the present invention are compared to traditional corn stalk pulping process, the technique is not required to carry out corn stover the physical separation of skin stalks of rice, wheat, etc. leaf, suitable for the full stalk slurrying of corn stover, part non-fiber component has been isolated while fibre fractionation is almost fully retained in the feed, pulping process chemical cost is few, gained pulp yield is high, intensity is good, and whole process avoids hyperbaric environment.Generated waste liquid can be directly used as the raw material of other processes.
Description
Technical field
The present invention relates to pulping technique by chemical-mechanical method field, in particular to a kind of full stalk chemical machinery legal system of corn stover
Sizing process.
Background technique
China's fibre resources are in short supply, and waste paper importation is limited.How existing resource is utilized, alleviates the immense pressure that there is lack of raw materials
It is extremely urgent.Developing non-wood pulping can effectively solve the problem that current predicament.And China's agricultural crop straw annual output is huge, corn
Stalk occupies the specific gravity of super one third, but the overwhelming majority therein is all directly burned, and causes serious pollution and waste.
Have some researchs using corn stover slurrying.
It is raw material chlorine-free bleaching paper pulp making technology that Chinese patent 200310124000.4, which discloses one kind and removes marrow cornstalk,
Using being raw material except the maize straw skin after marrow, disleaf, by boiling, bleaching obtains slurry.The technique need to carry out complicated and low
The skin stalks of rice, wheat, etc. leaf separation process of effect, and chemical steaming yield is lower.
Chinese patent 201510739676.7 discloses a kind of method of cornstalk biological slurrying, utilizes fermentation liquid pair
Cornstalk carries out fermentation process, then thermophilic digestion, obtains slurry after being centrifugated defibrination again.The cumbersome adds auxiliary agent
It is more, high expensive.
Chinese patent 200810236544.2 discloses a kind of method of cornstalk Mechanical Method sub-wire fibrosis, with chopping
Cornstalk afterwards is raw material, and defibrination obtains slurry after bleeding agent dipping is added.Bleeding agent is organic compound complexes, subsequent useless
Liquid processing is difficult, and high expensive.
To sum up, since corn stalk raw material heteroproteose cell is more, complicated skin stalks of rice, wheat, etc. leaf separation process is carried out, and at pulp yield
Low, physical strength is poor, and medical fluid consumption is big, and waste liquid is difficult.Therefore, corn stover never obtains reality in pulping and paper-making field
Border application.
Summary of the invention
The purpose of the present invention is to provide a kind of full stalk chemical mechanical pulping clean pulping process of corn stover, avoid inefficient
Skin stalks of rice, wheat, etc. leaf physical separation, remain in raw material most fibre fractionations, it is low to solve the full stalk pulping yield of corn stover,
Medical fluid consumption is big, and the problem of physical property difference is slurried, while hot water extracts waste liquid and pre-preg waste liquid in advance can also be used as other works
The raw materials for production of sequence are advantageously implemented full constituent high-value-use.
The technical solution adopted in the present invention is as follows:
To the corn stover pretreatment after cutting, then corn stover is separated with hot-water extraction liquid, it is isolated
Corn stover carry out squeeze grind handle and add washing slurry, the corn stover sodium hydroxide pre-preg after washing, then by corn stalk
Stalk carries out three sections of highly concentrated atmospheric refining runs, and after screened processing, gained slurry mixes after one section of atmospheric refining runs with good slurry again, finally
Disappear and to obtain final slurry after latent, washing and concentration.
Above technical scheme is not related to specific technological parameter, but according to non-wood-fiber feature, particular for corn
The full stalk slurrying of stalk, using hot water, extracting is handled in advance, and is combined and squeezed stone roller, soda-dip and multistage high consistency refining technology, can be obtained
To high yield pulp1, high-intensitive corn stover chemi-mechanical pulp.
Further, being breaking in traditional chaffcutter for corn stover carries out, and gained corn stover is having a size of 3-10cm.
Further, pretreatment refers to hot-water extraction, is carried out under atmospheric pressure environment using tap water, and tap water volume is added
It is 10-20 times of over dry material quality, extraction temperature is 80-99 DEG C, and soaking time is 40-60 minutes, isolated hot water
Extract can be recycled, and be sent after circulation 5-10 times to furfural process processed or fermentation sugaring process or producing methane process.
Preferably, the tap water additional amount of the hot-water extraction is 10 times of over dry material quality, extraction temperature 98
DEG C, soaking time is 60 minutes.Hot-water extraction liquid cycle-index is 8 times.
The present invention using hot-water extraction to corn stover carry out it is pretreated the reason is that:
(1) corn stover is made of straw skin, the stalks of rice, wheat, etc. and leaf.The fiber of maize straw skin is long, and draw ratio is big, and fiber fines contain
Amount is few, is the preferable raw material of pulping and paper-making.And the fiber of the stalks of rice, wheat, etc. and leaf is shorter, non-fiber constituent content is larger, if be fully retained by
Cause pulp quality poor.In addition, the structure of the stalks of rice, wheat, etc. and leaf is more loose, easily absorbs and consume a large amount of chemicals.
(2) current corn straw skin-stalk leaf separation equipment is mainly to come according to the principle of mechanical stripping or each position density contrast
Work.But due to the difference on connection effect filametntary in maize straw skin and the stalks of rice, wheat, etc. and corn stover physiological structure, cause
The inferior separating effect of stalks of rice, wheat, etc. leaf, low separation efficiency, energy consumption is high for separation process.
(3) hot-water extraction process is the process of water-soluble substance degradation dissolution in raw material.The lesser component of molecular weight is directly molten
Solution, and the biggish component of molecular weight realizes degradation dissolution under the action of hydrogen ion, belongs to physicochemical change.Hot-water extraction
Fibre fractionation in raw material can be made almost to be fully retained, and isolate most water solubility non-fiber group in the stalks of rice, wheat, etc. and leaf
Point, reduce the consumption of subsequent pre-preg section chemicals, and these leachables can be straight in sugaring or producing methane process
Connect utilization.
(4) hot-water extraction process is not required to add any chemicals, small to the corrosion of equipment, and investment is low with operating cost, can
Control property is strong.So the process choice pre-processes corn stalk raw material using hot-water extraction.
Further, squeezing stone roller processing is to squeeze to carry out in mill in twin-screw, and squeeze mill back segment in twin-screw and add tap water
Stalk is washed.The tap water volume being added is 3-8 times of corn stover absolute dry mass after squeezing stone roller.Washing Hou Shui can be used as down
The hot-water extraction water supplement of one circulation is recycled.The crowded stone roller processing can also carry out in kneader.
Preferably, the additional amount of crowded stone roller processing tap water is 5 times of corn stover absolute dry mass after squeezing stone roller.
Further, pre-preg is carried out under atmospheric pressure environment using sodium hydroxide solution, and the amount that sodium hydroxide is added is
The 5.5%-8% of corn stover absolute dry mass after grinding is squeezed, the tap water volume being added is to squeeze corn stover absolute dry mass after stone roller
10-20 times, dipping temperature is 80-99 DEG C, and soaking time is 30-60 minutes, and isolated pre-preg liquid can be recycled, and follow
It is sent after ring 5-10 times to lignin process processed or producing methane process.
Preferably, the additional amount of the pre-preg section sodium hydroxide is 6% of corn stover absolute dry mass after squeezing stone roller, institute
The tap water volume of addition is 10 times of corn stover absolute dry mass after squeezing stone roller, and dipping temperature is 98 DEG C, and soaking time is 40 minutes.
Maceration extract cycle-index is 6 times.
The purpose of pre-preg section is the swollen for promoting cellulose, realizes the softening of fiber, is conducive to the fiber separation of defibrination
And fibrillating, and reduce refining energy consumption.The dipping drug that the present invention uses is sodium hydroxide, it is possible to use other alkali electroless
Drug, such as potassium hydroxide, alkaline sulfite, alkaline hydrogen peroxide.But use alkaline sulfite as dipping drug
When, sulfur-containing compound can be introduced for system, increase waste liquor contamination load.
Further, three sections of highly concentrated atmospheric refining runs are carried out in highly concentrated normal pressure disc mill, and the slurry of first segment defibrination is dense to be
25%-35%, second segment, the slurry of third section defibrination are dense for 10%-20%.Disk mill gap is respectively 0.05-0.5mm etc..
Preferably, in three sections of highly concentrated atmospheric refining runs, the dense slurry of first segment defibrination is 30%, second segment, third section
The dense slurry of defibrination is 15%.Grinding clearance is respectively 0.5mm, 0.2mm and 0.08mm.
The mill of high density and high pressure defibrination or high density and high pressure in conjunction with highly concentrated Atmospheric Phase can also be used in the highly concentrated atmospheric refining runs
Slurry mode.
The number of segment of the high consistency refining can be selected according to the quality requirement being slurried.The appropriate defibrination number of segment that increases can be improved
Pulp quality, but will increase refining energy consumption.
Further, the pulp dilution obtained after three sections of highly concentrated atmospheric refining runs is pumped to vibrating screen to 1%-1.5% concentration
Screening, after fibre bundle screening reject is discharged by slag-drip opening, is transported in fiberizer and carries out secondary treatment, gained slurry is good with the preceding paragraph again
Slurry mixing.
Further, gained slurry, which disappear, obtains high yield pulp1, high-intensitive chemi-mechanical pulp after latent, washing and concentration.
The beneficial effects of the present invention are:
(1) conventional chemical-mechanical method pulping process is compared, which is suitable for the full stalk slurrying of corn stover, pulping process
Product consumption is few, and pollution is small, and gained pulp yield is high, intensity is good.
(2) corn stover is pre-processed using hot-water extraction, avoids the physical separation of inefficient skin stalks of rice, wheat, etc. leaf, retained
Available cellulosic component in most of stalks of rice, wheat, etc. and leaf, while hot-water extraction also significantly reduces disappearing for subsequent pre-preg section drug
Consumption.In addition, hot-water extraction liquid is recycled, waste liquid after repeatedly recycling can be directly as furfural processed or sugaring or producing methane
Raw material avoids the waste of non-fiber component.And in furfural processed or sugaring or producing methane process, the water that is concentrated to get but also as
The fresh water of hot-water extraction section uses, and is not required to additionally add clear water.
(3) pre-preg liquid is recycled, and the waste liquid after repeatedly recycling can be kept away directly as furfural processed or the raw material of biogas
The waste of non-fiber component is exempted from.And in furfural processed or biogas process, the water being concentrated to get is but also as the fresh of pre-preg section
Water uses, and is not required to additionally add clear water.
(4) the technique whole process carries out under normal pressure, is not necessarily to pressure high-temp resistant equipment, reduces equipment investment.
Specific embodiment
The present invention is described in detail With reference to embodiment.
Embodiment 1
(1) corn stover is cut into having a size of 3-10cm's with chaffcutter first as raw material using the full stalk of corn stover
Segment.
(2) corn stover after cutting is fitted into digester or extracting tank, tap water is added, quality is over dry corn stover
20 times of quality, extraction temperature are 98 DEG C, and soaking time is 60 minutes.
(3) twin-screw after the corn stover and hot water separation after extracting, will be added and squeeze to squeeze in mill and grind, and after squeezing mill
Section plus tap water wash stalk, and additional amount is 5 times for squeezing the corn stover absolute dry mass after grinding.
(4) dewatered corn stover is fitted into digester or pre-preg device, sodium hydroxide is added, quality is after squeezing stone roller
The 8% of corn stover absolute dry mass, the tap water volume being added are 20 times of corn stover absolute dry mass after squeezing stone roller, dipping temperature
It is 80 DEG C, soaking time is 60 minutes.
(5) corn stover after pre-preg carries out three sections of high consistency refinings, and grinding clearance is respectively 0.5mm, 0.2mm and
0.1mm。
(6) pulp dilution obtained after three sections of high consistency refinings is pumped to vibrating screen screening, fibre to 1%-1.5% concentration
It after dimension beam screening reject is discharged by slag-drip opening, is transported in fiberizer and carries out secondary treatment, gained slurry is mixed with good slurry again.
(7) gained slurry, which disappear, obtains final slurry after latent, washing and concentration.
(8) through performance detection, the yield of the above-mentioned resulting corn stover reducing rules of processing step is 47.4%, physical property
Are as follows: quantification of 112 ± 5g/m of handsheet2, tightness >=0.5g/cm3, fracture length >=4.18km, ring crush index >=10.27Nm/
g。
Embodiment 2
(1) corn stover is cut into having a size of 3-10cm's with chaffcutter first as raw material using the full stalk of corn stover
Segment.
(2) corn stover after cutting is fitted into digester or extracting tank, tap water is added, quality is over dry corn stover
20 times of quality, extraction temperature are 98 DEG C, and soaking time is 60 minutes.
(3) twin-screw after the corn stover and hot water separation after extracting, will be added and squeeze to squeeze in mill and grind, and after squeezing mill
Section plus tap water wash stalk, and additional amount is 5 times for squeezing the corn stover absolute dry mass after grinding.
(4) dewatered corn stover is fitted into digester or pre-preg device, sodium hydroxide is added, quality is after squeezing stone roller
The 5.5% of corn stover absolute dry mass, the tap water volume being added are 10 times of corn stover absolute dry mass after squeezing stone roller, dipping temperature
Degree is 98 DEG C, and soaking time is 40 minutes.
(5) corn stover after pre-preg carries out three sections of high consistency refinings, and grinding clearance is respectively 0.5mm, 0.2mm and
0.1mm。
(6) pulp dilution obtained after three sections of high consistency refinings is pumped to vibrating screen screening, fibre to 1%-1.5% concentration
It after dimension beam screening reject is discharged by slag-drip opening, is transported in fiberizer and carries out secondary treatment, gained slurry is mixed with good slurry again.
(7) gained slurry, which disappear, obtains final slurry after latent, washing and concentration.
(8) through performance detection, the yield of the above-mentioned resulting corn stover reducing rules of processing step is 49.6%, physical property
Are as follows: quantification of 112 ± 5g/m of handsheet2, tightness >=0.5g/cm3, fracture length >=3.65km, ring crush index >=10.93Nm/
g。
Embodiment 3
(1) corn stover is cut into having a size of 3-10cm's with chaffcutter first as raw material using the full stalk of corn stover
Segment.
(2) corn stover after cutting is fitted into digester or extracting tank, the hot water that last cycle period is isolated is added
Extract, and add to squeeze and grind washing water, cycle-index is 4 times, and the quality of mixing water is 10 times of over dry corn stover quality, is taken out
Temperature raising degree is 98 DEG C, and soaking time is 60 minutes.
(3) twin-screw after the corn stover and hot water separation after extracting, will be added and squeeze to squeeze in mill and grind, and after squeezing mill
Section plus tap water wash stalk, and additional amount is 5 times for squeezing the corn stover absolute dry mass after grinding.
(4) dewatered corn stover is fitted into digester or pre-preg device, sodium hydroxide is added, quality is after squeezing stone roller
The 6% of corn stover absolute dry mass, the liquid being added are the pre-preg liquid that last cycle period is isolated, and additional amount is to squeeze to grind
10 times of corn stover absolute dry mass afterwards, dipping temperature are 98 DEG C, and soaking time is 40 minutes.
(5) corn stover after pre-preg carries out three sections of high consistency refinings, and grinding clearance is respectively 0.5mm, 0.2mm and
0.1mm。
(6) pulp dilution obtained after three sections of high consistency refinings is pumped to vibrating screen screening, fibre to 1%-1.5% concentration
It after dimension beam screening reject is discharged by slag-drip opening, is transported in fiberizer and carries out secondary treatment, gained slurry is mixed with good slurry again.
(7) gained slurry, which disappear, obtains final slurry after latent, washing and concentration.
(8) through performance detection, the yield of the above-mentioned resulting corn stover reducing rules of processing step is 50.1%, physical property
Are as follows: quantification of 112 ± 5g/m of handsheet2, tightness >=0.5g/cm3, fracture length >=4.7km, ring crush index >=11.45Nm/
g。
The present invention relates to a kind of cleaning pulping production technologies of the full stalk of corn stover, and production process is using hot water to corn stalk
Stalk raw material is pre-processed, and the acidic-group on feed components (predominantly hemicellulose) is attacked by hydrogen ion, institute
The carboxylic acid of formation further promotes falling off for more multi-carboxy acid group, the lesser soluble component of molecular weight in reverse as catalyst again
It can directly dissolve, and the biggish component of molecular weight is then first degraded and is dissolved out again.Hot-water extraction changes the chemistry of corn stalk raw material
Component and architectural characteristic are conducive to the production of subsequent chemical mechanical slurry.This technique is high at pulp yield, intensity is good, and pulping process is dirty
Contaminate small, chemical cost is few, and equipment investment is low, moreover it is possible to realize the high-value-use of full constituent.
The above is only that set forth preferred embodiment of the invention, not makees limit in any form to the present invention
System, any simple modification that embodiment of above is made according to the technical essence of the invention, equivalent variations and modification,
Belong in the range of technical solution of the present invention.
Claims (8)
1. a kind of full stalk chemical mechanical pulping clean pulping process of corn stover, it is characterised in that follow the steps below:
Hot-water extraction pretreatment is carried out to the corn stover after cutting, then separates corn stover with hot-water extraction liquid,
Isolated corn stover, which squeeze grinding, handles and adds washing slurry, the corn stover sodium hydroxide pre-preg after washing, then
Corn stover is subjected to three sections of defibrinations, after screened processing, gained slurry mixes after one section of defibrination with good slurry again, finally carries out
Disappear and obtains high yield pulp1, high-intensitive chemi-mechanical pulp after latent, washing and concentration.
2. pulping process according to claim 1, it is characterised in that: the corn stover is breaking in traditional chaffcutter
It carries out, gained corn stover is having a size of 3-10cm.
3. pulping process according to claim 1, it is characterised in that: the pretreatment refers to hot-water extraction, be using
What tap water carried out under atmospheric pressure environment, 10-20 times that tap water volume is over dry material quality, extraction temperature 80-99 is added
DEG C, soaking time is 40-60 minutes.Isolated hot-water extraction liquid can be recycled, and be sent to furfural processed after circulation 5-10 times
Process or fermentation sugaring process or producing methane process.
4. pulping process according to claim 1, it is characterised in that: the crowded stone roller processing is squeezed in mill in twin-screw
It carries out, and adds water to wash stalk in the back segment that twin-screw squeezes mill.Wash hot-water extraction of the rear water as subsequent cycle
Water supplement is recycled.
5. pulping process according to claim 1, it is characterised in that: the pre-preg is using sodium hydroxide in normal pressure
It is carried out under environment.The amount that sodium hydroxide is added is the 5.5%-8% of over dry material quality, and the tap water volume being added is over dry
10-20 times of material quality, dipping temperature are 80-99 DEG C, and soaking time is 30-60 minutes.Isolated pre-preg liquid can
It is recycled, is sent to lignin process or producing methane process processed after circulation 5-10 times.
6. pulping process according to claim 1, it is characterised in that: three sections of highly concentrated atmospheric refining runs are highly concentrated normal
It is carried out in pressure fiberizer, the dense slurry of first segment defibrination is 25%-35%, and second segment, the slurry of third section defibrination are dense for 10%-
20%.Disk mill gap is respectively 0.05-0.5mm etc..
7. pulping process according to claim 1, it is characterised in that: the pulp dilution obtained after three sections of defibrinations to 1%-
1.5% concentration, is pumped in vibrating screen and sieves, after fibre bundle screening reject is discharged by slag-drip opening, be transported in fiberizer carry out it is secondary
Processing, gained slurry are mixed with the good slurry of upper section again.
8. pulping process according to claim 1, it is characterised in that: gained slurry disappear after latent, washing and concentration
To high yield pulp1, high-intensitive chemi-mechanical pulp.
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| CN201811414874.6A CN110080027B (en) | 2018-11-26 | 2018-11-26 | Corn straw whole-stalk chemico-mechanical pulping process |
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| CN201811414874.6A CN110080027B (en) | 2018-11-26 | 2018-11-26 | Corn straw whole-stalk chemico-mechanical pulping process |
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Cited By (6)
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| CN110714351A (en) * | 2019-09-29 | 2020-01-21 | 山东世纪阳光纸业集团有限公司 | Process for pulping and papermaking of plant fiber in bio-mechanical or chemical-mechanical manner |
| CN111689807A (en) * | 2020-05-25 | 2020-09-22 | 中国制浆造纸研究院有限公司 | Method for preparing chemi-mechanical pulp by using corn straw potash process and extracting pulping waste liquid to prepare fertilizer |
| CN111877039A (en) * | 2020-08-05 | 2020-11-03 | 玖龙纸业（太仓）有限公司 | Mechanical pulp production system and production process using wood shavings as raw materials |
| CN112431052A (en) * | 2020-11-05 | 2021-03-02 | 江西中竹生物质科技有限公司 | Ultrasonic pulping method of corn straw |
| CN112726249A (en) * | 2020-12-29 | 2021-04-30 | 陕西科技大学 | Dissolving pulp prepared from corn straw skins and method |
| CN115012240A (en) * | 2022-06-02 | 2022-09-06 | 上海昶法新材料有限公司 | Corn straw full-stalk enzymatic pulping method and paper pulp |
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